US10126339B2 - Methods and devices for switching filters and medical apparatuses using the same - Google Patents
Methods and devices for switching filters and medical apparatuses using the same Download PDFInfo
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- US10126339B2 US10126339B2 US14/822,588 US201514822588A US10126339B2 US 10126339 B2 US10126339 B2 US 10126339B2 US 201514822588 A US201514822588 A US 201514822588A US 10126339 B2 US10126339 B2 US 10126339B2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
- G01R23/165—Spectrum analysis; Fourier analysis using filters
- G01R23/167—Spectrum analysis; Fourier analysis using filters with digital filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0294—Variable filters; Programmable filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/04—Recursive filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/0294—Variable filters; Programmable filters
- H03H2017/0295—Changing between two filter characteristics
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/04—Recursive filters
- H03H2017/0477—Direct form I
Definitions
- the disclosure relates to the field of signal processing and, more particularly, to methods and devices for switching filters and medical apparatuses using the same.
- a filter is a common device in the field of signal processing, through which signals within a particular frequency range can be passed, while other signals outside the particular frequency range will be blocked.
- the frequency range that is allowed to pass through a corresponding filter is fixed, that is, each filter corresponds to a fixed frequency range, and if the frequency ranges of an input signal are not fixed, that is, the input signal includes a plurality of frequency ranges, it may need more than one filter to serve for the input signal.
- the frequency ranges of the input signal are changed, that is, when the frequency range of the input signal is changed from one to another, it needs to switch the filter from one to another correspondingly. Referring to FIG. 1 , it is assumed that a desired output signal would be an output signal as shown in FIG.
- the actual output signal may be the distorted output signal after the switching as shown in FIG. 1 .
- Embodiments of the current disclosure provide methods and devices for switching filters and medical apparatuses using the same, which can be directed to reduce the distortion of an output signal resulting from the switching of the filter.
- a method for switching filters including: detecting whether or not a frequency range of an input signal is changed from a first frequency range into a second frequency range, wherein the first frequency range is a frequency range within which a first filter is able to work, and the second frequency range is a frequency range within which a second filter is able to work; if changed, switching from the first filter to the second filter, and taking a sample value of the input signal at a current moment as an input value of the second filter at the current moment and sample values of the input signal at n moments before the current moment as input values of the second filter at the n moments, respectively, and taking output values of the first filter at m moments before the current moment as output values of the second filter at the m moments, to obtain an output value of the second filter at the current moment, wherein n and m are both positive integers.
- the step of taking a sample value of the input signal at a current moment as an input value of the second filter at the current moment and sample values of the input signal at n moments before the current moment as input values of the second filter at the n moments, respectively, and taking output values of the first filter at m moments before the current moment as output values of the second filter at the m moments, to obtain an output value of the second filter at the current moment comprises: setting the sample value of the input signal received by the second filter at the current moment and the sample values of the input signal received by the second filter at the n moments before the current moment as (X 0 , X 1 , . . . , X n ), magnifying the sample values (X 0 , X 1 , . .
- the method further comprising: setting part or all of X 1 , . . . , X n to equal to a first specified value, wherein the first specified value is any one of X 1 , . . . , X n , or the first specified value is an average value of (X 0 , X 1 , . . . , X n ) or a weighted value of X 1 , . . . , X n .
- the method further comprising: setting part or all of Y 1 , . . . , Y m to equal to a second specified value, wherein the second specified value is any one of Y 1 , . . . , Y m , or the second specified value is an average value of Y 1 , . . . , Y m or a weighted value of Y 1 , . . . , Y m .
- a device for switching filters including: a detecting component, a switching component and an output value obtaining component; the detecting component, which is configured to detect whether or not a frequency range of an input signal is changed from a first frequency range into a second frequency range, wherein the first frequency range is a frequency range within which a first filter is able to work, and the second frequency range is a frequency range within which a second filter is able to work; the switching component, which is configured to switch from the first filter to the second filter when the frequency range of the input signal is changed from the first frequency range into the second frequency range; the output value obtaining component, which is configured to take a sample value of the input signal at a current moment as an input value of the second filter at the current moment and sample values of the input signal at n moments before the current moment as input values of the second filter at the n moments, respectively, and take output values of the first filter at m moments before the current moment as output values of the second filter at the m moments
- the output value obtaining component is configured to set the sample value of the input signal received by the second filter at the current moment and the sample values of the input signal received by the second filter at the n moments before the current moment as sample values (X 0 , X 1 , . . . , X n ), magnifying the sample values (X 0 , X 1 , . . . , X n ) according to each corresponding magnification factor (c 0 , c 1 , . . .
- the device further includes a first value setting component, the first value setting component is configured to set part or all of X 1 , . . . , X n to equal to a first specified value, wherein the first specified value is any one of X 1 , . . . , X n , or the first specified value is an average value of X 1 , . . . , X n or a weighted value of X 1 , . . . , X n .
- the device further includes a second value setting component, the second value setting component is configured to set part or all of Y 1 , . . . , Y m to equal to a second specified value, wherein the second specified value is any one of Y 1 , . . . , Y m , or the second specified value is an average value of Y 1 , . . . , Y m or a weighted value of Y 1 , . . . , Y m .
- a medical detecting apparatus including: a detecting component, a switching component and an output value obtaining component; the detecting component, which is configured to detect whether or not a frequency range of an input signal is changed from a first frequency range into a second frequency range, wherein the first frequency range is a frequency range within which a first filter is able to work, and the second frequency range is a frequency range within which a second filter is able to work; the switching component, which is configured to switch from the first filter to the second filter when the frequency range of the input signal is changed from the first frequency range into the second frequency range; the output value obtaining component, which is configured to take a sample value of the input signal at a current moment as an input value of the second filter at the current moment and sample values of the input signal at n moments before the current moment as input values of the second filter at the n moments, respectively, and take output values of the first filter at m moments before the current moment as output values of the second filter at the m moments
- the output value obtaining component is configured to set the sample value of the input signal received by the second filter at the current moment and the sample values of the input signal received by the second filter at the n moments before the current moment as sample values (X 0 , X 1 , . . . , X n ), magnifying the sample values (X 0 , X 1 , . . . , X n ) according to each corresponding magnification factor (c 0 , c 1 , . . .
- the medical detecting apparatus further includes a first value setting component, the first value setting component is configured to set part or all of X 1 , . . . , X n to equal to a first specified value, wherein the first specified value is any one of X 1 , . . . , X n , or the first specified value is an average value of X 1 , . . . , X n or a weighted value of X 1 , . . . , X n .
- the medical detecting apparatus further includes a second value setting component, the second value setting component is configured to set part or all of Y 1 , . . . , Y m to equal to a second specified value, wherein the second specified value is any one of Y 1 , . . . , Y m , or the second specified value is an average value of Y 1 , . . . , Y m or a weighted value of Y 1 , . . . , Y m .
- the frequency range of the input signal is changed from the first frequency range into the second frequency range. If changed, it can switch from the first filter to the second filter, a sample value of the input signal at a current moment can be taken as an input value of the second filter at the current moment and sample values of the input signal at n moments before the current moment can be taken as input values of the second filter at the n moments, respectively, and output values of the first filter at m moments before the current moment can be taken as output values of the second filter at the m moments, to obtain an output value of the second filter at the current moment.
- the sudden change of the output values caused by the filter switching could be avoided.
- FIG. 1 is a comparison chart of a desired output signal and a distorted output signal caused by switching of filters according to a prior art
- FIG. 2 is a flowchart of a method for switching filters according to one embodiment of the current disclosure
- FIG. 3 is a structure diagram of a device for switching filters to implement the method for switching filters as shown in FIG. 2 according to one embodiment of the current disclosure.
- FIG. 4 is a structure diagram of a device for switching filters according to another embodiment of the current disclosure.
- FIG. 2 it is a flowchart of a method for switching filters according to one embodiment of the current disclosure.
- the method for switching filters according to the current disclosure includes steps as follows.
- Step 210 detecting whether or not a frequency range of an input signal is changed from a first frequency range into a second frequency range.
- the filters may be switched by a switch 330 such that the first filter 310 stops working and the second filter 320 enters a working state. If the frequency range of the input signal is not changed from the first frequency range into the second frequency range, the method returns to the step 210 ; if the frequency range of the input signal is changed from the first frequency range into the second frequency range, the method enters step 220 .
- the first frequency range is a frequency range within which the first filter 310 is able to work
- the second frequency range is a frequency range within which the second filter 320 is able to work.
- Step 220 switching from the first filter 310 to the second filter 320 .
- Step 230 taking a sample value of the input signal at a current moment as an input value of the second filter 320 at the current moment and sample values of the input signal at n moments before the current moment as input values of the second filter 320 at said n moments, and taking output values of the first filter 310 at m moments before the current moment as output values of the second filter 320 at said m moments, to obtain an output value of the second filter 320 at the current moment.
- the sample value of the input signal received by the second filter 320 at the current moment can be set as a sample value X 0
- the sample values of the input signal received by the second filter 320 at n moments before the current moment can be set as sample values (X 1 , . . .
- the output values of the second filter 320 at m moments before the current moment can be set as output values (Y 1 , . . . , Y m ) of the first filter 310 at said m moments, respectively.
- the magnified output values may be summed to obtain a second sum value S y .
- sampled values may be input to the first filter 310 in the order of X n , . . . , X 1 , X 0 through an input end of the first filter 310 .
- a sampled value X n may be pushed to a delayer in a delay-amplifier branch of a first input end after input to the first filter 310 ;
- the sampled value X n may be pushed to a delayer at a delay-amplifier branch of a second input end, while the sampled value X n-1 may be pushed to a delayer at a delay-amplifier branch of the first input end; and so on, until, at the current moment, the sampled signal X n may be pushed to a delayer at a delay-amplifier branch of
- the switch 330 can be activated, so that the sampled value X 0 in an input branch of the first filter 310 can be input to an amplifier with a magnification factor of c 0 in an input branch of the second filter 320 to obtain an amplified signal c 0 X 0 , and the sampled value X 1 of the delayer at the delay-amplifier branch of the first input end of the first filter 310 can be input to an amplifier with a magnification factor of c 1 in the delay-amplifier branch of the first input end of the second filter 320 to obtain an amplified signal c 1 X 1 , . . .
- the sampled value X n of the delayer at the delay-amplifier branch of the n-th input end of the first filter 310 can be input to an amplifier with a magnification factor of c n in the delay-amplifier branch of the n-th input end of the second filter 320 to obtain an amplified signal c n X n .
- output signals may be output from the first filter 310 in the order of Y m , . . . , Y 1 .
- the output signal Y m may be pushed to a delayer at a delay-amplifier branch of a first output end; at the (m ⁇ 1)th moment before the current moment, the output signal Y m-1 may be output from the first filter 310 , in the meantime, the output signal Y m may be pushed to a delayer at a delay-amplifier branch of a second output end, while the output signal Y m-1 may be pushed to a delayer at a delay-amplifier branch of the first output end; and so on, until, at the current moment, the output signal Y 1 may be pushed to a delayer at a delay-amplifier branch of the first output end,
- the switch 330 can be activated, so that the output value Y 1 for the delayer at the delay-amplifier branch of the first output end of the first filter 310 can be input to an amplifier with a magnification factor d 1 in the delay-amplifier branch of the first output end of the second filter 320 , thus obtaining an amplified signal d 1 Y 1 , and the output value Y 2 of the delayer at the delay-amplifier branch of the second output end of the first filter 310 can be input to an amplifier with a magnification factor d 2 of the second filter 320 , thus obtaining an amplified signal d 2 Y 2 ; . . .
- the output value Y m of the delayer at the delay-amplifier branch of the m-th output end of the first filter 310 can be input to an amplifier with a magnification factor d m of the second filter 320 , thus obtaining an amplified signal d m Y m .
- first filter 310 and the second filter 320 are just one embodiment of the current disclosure, and that in other embodiments, the first filter 310 and the second filter 320 may also include other structures, which will not be restricted here in embodiments of the current disclosure.
- the sample value of the input signal received by the second filter 320 at the current moment can be set as a sample value X 0
- the sample values of the input signal received by the second filter 320 at n moments before the current moment can be set as sample values (X 1 , . . . , X n ), respectively.
- the sample values X 0 and (X 1 , . . . , X n ) are magnified according to each corresponding magnification factor (c 0 , c 1 , . . . , c n ) of the second filter 320
- the magnified sample values may be summed to obtain a first sum value.
- the output values of the second filter 320 at m moments before the current moment can be set as output values (Y 1 , . . . , Y m ) of the first filter at said m moments, respectively.
- the magnified output values may be summed to obtain a second sum value S y .
- the sudden change of the output values caused by the filter switching could be avoided.
- the sample value X 0 at the current moment and the sample values (X 1 , . . . , X n ) of the input signal at the n moments before the current moment can be set to be a first specified value, as input values of the second filter 320 , where, the first specified value is any one of X 1 , . . . , X n ).
- the first specified value can be set to be X 1 , after the first specified value is magnified according to each corresponding magnification factor (c 0 , c 1 , . . .
- the output values (Y 1 , . . . , Y m ) of the first filter 310 at the in moments before the current moment can be set to be a second specified value, as output values of the second filter 320 at the m moments, where, the second specified value is any one of Y 1 , . . . , Y m .
- part of the sample values (X 0 , X 1 , . . . , X n ) can be set to equal to the first specified value, and the others to remain unchanged; furthermore, part of the output values (Y 1 , . . . , Y m ) can be set to equal to the second specified value, and the others to remain unchanged.
- the first specified value can be set to equal to an average value of (X 0 , X 1 , . . . , X n ) or a weighted value of (X 0 , X 1 , . . . , X n ).
- the second specified value can be set to equal to an average value or a weighted value of (Y 1 , . . . , Y m ).
- the device for switching filters 400 disclosed by the embodiment includes: a detecting component 410 , a switching component 420 , and an output value obtaining component 430 .
- the detecting component 410 may be configured to detect whether or not a frequency range of an input signal is changed from a first frequency range into a second frequency range, wherein the first frequency range is a frequency range within which a first filter is able to work, and the second frequency range is a frequency range within which a second filter is able to work.
- the switching component 420 may be configured to switch from the first filter to the second filter when the frequency range of the input signal is changed from the first frequency range into the second frequency range.
- the output value obtaining component 430 may be configured to take a sample value of the input signal at a current moment as an input value of the second filter at the current moment and sample values of the input signal at n moments before the current moment as input values of the second filter at the n moments, respectively, and take output values of the first filter at m moments before the current moment as output values of the second filter at the m moments, to obtain an output value of the second filter at the current moment, wherein n and m are both positive integers.
- the output value obtaining component 430 may be configured to set the sample value of the input signal received by the second filter at the current moment and the sample values of the input signal received by the second filter at the n moments before the current moment as sample values (X 0 , X 1 , . . . , X n ) magnifying the sample values (X 0 , X 1 , . . . , X n ) according to each corresponding magnification factor (c 0 , c 1 , . . .
- the device for switching filters 400 further includes a first value setting component, the first value setting component may be configured to set all of X 1 , . . . , X n to equal to a first specified value, where, the first specified value is any one of X 1 , . . . , X n .
- the device for switching filters 400 further includes a second value setting component, the second value setting component may be configured to set all of Y 1 , . . . , Y m to equal to a second specified value, where, the second specified value is any one of Y 1 , . . . , Y m .
- the steps of the method for switching filters can be implemented in the device for switching filters 400 , which can refer to FIG. 2 and a related description, and will not be repeated here in embodiments of the current disclosure.
- a medical detecting apparatus is further provided in one embodiment of the current disclosure, wherein, the medical detecting apparatus includes the device for switching filters 400 as described above.
- the program may be stored in a computer readable storage medium. When executed, the program may execute processes in the above-mentioned embodiments of methods.
- the storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), et al.
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CN201510267249.3A CN105099396B (en) | 2015-05-22 | 2015-05-22 | Filter switching method and device and medical equipment |
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CN112019190B (en) * | 2020-10-26 | 2021-01-22 | 宁波中车时代传感技术有限公司 | Combined filtering method and system for stationary signals |
CN116648856A (en) * | 2021-12-17 | 2023-08-25 | 华为技术有限公司 | IIR filter assembly, audio device and coefficient switching method |
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US5157623A (en) * | 1989-12-30 | 1992-10-20 | Casio Computer Co., Ltd. | Digital filter with dynamically variable filter characteristics |
US20140142395A1 (en) * | 2011-04-12 | 2014-05-22 | Frank Sattler | Apparatus and method for data processing of physiological signals |
US20140240605A1 (en) * | 2013-02-25 | 2014-08-28 | Ganesh Ramaswamy Basawapatna | Apparatus for Very High Speed Adaptive Spectrum Analysis |
US9324348B2 (en) * | 2014-07-17 | 2016-04-26 | International Business Machines Corporation | Detecting a servo pattern using a data channel in a magnetic tape drive |
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JPH0685670A (en) * | 1992-09-03 | 1994-03-25 | Hitachi Ltd | Method and system for sampling |
TW379512B (en) * | 1997-06-30 | 2000-01-11 | Matsushita Electric Ind Co Ltd | Apparatus for localization of a sound image |
CN1774862A (en) * | 2003-04-17 | 2006-05-17 | 皇家飞利浦电子股份有限公司 | Adaptive filtering |
CN100563381C (en) * | 2007-04-23 | 2009-11-25 | 北京中星微电子有限公司 | A kind of method and apparatus of avoiding composite noise |
US8212923B2 (en) * | 2010-04-13 | 2012-07-03 | Newport Media, Inc. | SECAM line identification and PAL switch |
CN102291347B (en) * | 2011-09-02 | 2014-10-29 | 大唐移动通信设备有限公司 | DPD (Digital Pre-Distortion) processing method and equipment based on multiband spectrum |
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US5157623A (en) * | 1989-12-30 | 1992-10-20 | Casio Computer Co., Ltd. | Digital filter with dynamically variable filter characteristics |
US20140142395A1 (en) * | 2011-04-12 | 2014-05-22 | Frank Sattler | Apparatus and method for data processing of physiological signals |
US20140240605A1 (en) * | 2013-02-25 | 2014-08-28 | Ganesh Ramaswamy Basawapatna | Apparatus for Very High Speed Adaptive Spectrum Analysis |
US9324348B2 (en) * | 2014-07-17 | 2016-04-26 | International Business Machines Corporation | Detecting a servo pattern using a data channel in a magnetic tape drive |
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CN105099396B (en) | 2020-10-16 |
US20160344371A1 (en) | 2016-11-24 |
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